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aniked [119]
3 years ago
9

Pls answer questions 8 and 9 PLSSS The test statistic

Mathematics
1 answer:
marusya05 [52]3 years ago
6 0

Answer:

8) B

9) D

*ASSUMING THE ALPHA-LEVELS FOR THESE PROBLEMS IS .05.*

Step-by-step explanation:

8) Left-tailed test means that the alternate hypothesis is x is less than a certain  value. The p-value, on the calculator, is normalcdf(-999, -1.83) if it's left-tailed, which is .0336. In that case, we would reject the null hypothesis, because the alpha-level is above our p-value.

9) Two-tailed test means that the alternate hypothesis is x does not equal a certain value. The p-value for this, on the calculator, is normalcdf(1.95,999) times two, because we need both tails. In this case, we would fail to reject the null hypothesis, assuming our alpha-level is .05.

  • normalcdf(1.95,999) = .0256*2 = .0512.
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Solve for x in the equation x squared minus 10 x + 25 = 35.
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Answer:

x = 5 ± \sqrt{35}

Step-by-step explanation:

Given

x² - 10x + 25 = 35 ( subtract 25 from both sides )

x² - 10x = 10

Using the method of completing the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(- 5)x + 25 = 10 + 25

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x - 5 = ± \sqrt{35} ( add 5 to both sides )

x = 5 ± \sqrt{35}

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7 0
3 years ago
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Evgen [1.6K]
And the chicken was half uncooked
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A videp store took $450 in DVD rentals during one day . If DVDs rent for $9 each , how many DVDs were rented.
Masja [62]

Answer:

50

Step-by-step explanation:

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450=9x

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4 0
2 years ago
Please help I'm stuck on these 2 problems would help so much!!<br><br> Thanks!
MrRa [10]
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4 0
3 years ago
The ratio of Alex's toy cars to Jim's is 8:3. How many toy cars do they have altogether, if Alex has 40 more cars than Jim?
aniked [119]

Answer:

88

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8:3

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Step-by-step explanation:

Hope i helped!  have a nice day

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